Faster builds: make sure webpack optimization is off in build-dev

webpack.dev.js

@@ -5,5 +5,11 @@ module.exports = [
   merge.merge(prod_configs[0], {
     mode: 'development',
     devtool: 'inline-source-map',
+    optimization: {
+      minimize: false,
+      removeAvailableModules: false,
+      removeEmptyChunks: false,
+      splitChunks: false,
+    },
   }),
 ];